Selectors always describe exactly what the method does and what it needs. For example, stringByAppendingStringWithFormat: says "You will get a new string, by appending a format string to the receiver." There is also the mutable counterpart, appendStringWithFormat:, which is shorter because it doesn't return a new string, instead, appending directly to the receiver.

Verbose selectors make Objective-C self-documenting at the cost of extra typing. But autocomplete solves this problem because you only ever have to type 2-5 characters to insert the method you want (once you are experienced enough to predict what autocomplete will spit out).

Objective-C naming conventions form predictable patterns. Inexperienced programmers gripe because they have yet to figure out these patterns, good programmers love Objective-C because they understand these patterns and can therefore predict the name of a method and its arguments and great programmers write their own classes that use these patterns.